NXP Semiconductors MPC9608FA

Overview

MPC9608FA from NXP Semiconductors (formerly Freescale) is a 3.3 V, 1:10 LVCMOS zero-delay clock buffer with PLL-based phase alignment, designed for high-performance clock tree distribution in networking and telecom systems. It delivers 12.5–200 MHz input frequency support, <150 ps all-output skew, and dual-bank synchronized outputs (QA0–QA4 and QB0–QB4), enabling nested clock architectures with near-zero insertion delay.

For engineers reviewing the MPC9608FA datasheet, MPC9608FA pinout, MPC9608FA application, or MPC9608FA equivalent, key selection criteria include its 32-lead LQFP package, selectable divide-by-two on Bank B, synchronous CLK_STOP control, tristate OE capability, and PLL bypass mode for low-frequency system test - all critical for deterministic timing in PowerQUICC I/II-compatible designs.

Technical Context

The MPC9608FA uses an internal PLL with external feedback (QFB → FB_IN) to lock output phase to the reference clock, achieving static phase offset of ±175 ps and cycle-to-cycle jitter of 150 ps RMS. Its dual-output banks operate synchronously, with Bank B configurable via BSEL to either mirror Bank A or divide by two - both maintaining alignment to the CCLK reference.

It features separate analog (VCCA) and digital (VCC) power domains, requiring an external RC filter on VCCA to suppress 100 kHz–20 MHz noise and maintain ≤125 ps I/O phase jitter. The device supports parallel-terminated (1× 50 Ω) or series-terminated (2× 50 Ω) transmission lines, delivering effective fanout up to 1:20 while maintaining sub-100 ps intra-bank skew.

Key Specifications

Pinout & Package

Package: 32-lead LQFP (7×7 mm², case 873A-03), Pb-free, with exposed thermal pad (not electrically connected). Pin 1 index marked; lead pitch 0.8 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar zero-delay clock buffer applications.

Compared with IDT5V9885BGI and ICS853S111AGI, the MPC9608FA uniquely combines 10 LVCMOS outputs, programmable Bank B division, PLL bypass for diagnostics, and dual-supply filtering - making it optimal for complex, testable, and noise-sensitive telecom clock trees where phase determinism is non-negotiable.

Availability

MPC9608FA is available at Aetrix Electronics and suitable for telecom infrastructure, network processor platforms, and industrial control systems requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.

Supply support for MPC9608FA includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and communications markets, with deep heritage in high-performance timing and microcontroller technologies.

The MPC9608FA belongs to NXP's Advanced Clock Drivers product line, engineered specifically for deterministic, low-skew clock distribution in carrier-class networking and telecom equipment where timing integrity directly impacts system throughput and reliability.

FAQ

What is the function of the QFB and FB_IN pins on the MPC9608FA?

The QFB pin outputs the PLL feedback signal, which must be connected directly to the FB_IN pin to close the zero-delay loop. This external feedback path allows the MPC9608FA to align output edges precisely with the CCLK reference edge, achieving near-zero insertion delay. The trace between QFB and FB_IN contributes directly to static phase offset and must be kept short and matched to minimize skew impact.

How does the BSEL pin affect clock output frequencies on the MPC9608FA?

When BSEL = 0, the MPC9608FA's Bank B outputs (QB0–QB4) replicate Bank A's frequency; when BSEL = 1, they operate at exactly half the Bank A frequency - e.g., 100 MHz input yields 100 MHz on QA0–QA4 and 50 MHz on QB0–QB4. This division is synchronous and preserves phase alignment between banks, supporting mixed-frequency clock domains without external dividers.

Can the MPC9608FA operate without an external RC filter on the VCCA pin?

No - the MPC9608FA requires an external RC filter (9–10 Ω resistor + 33–100 nF capacitor) on the VCCA pin to suppress 100 kHz–20 MHz power supply noise. Without this filter, analog PLL performance degrades significantly: I/O phase jitter increases beyond the specified 125 ps RMS, and long-term stability under load may fall outside AC specifications.

What happens to downstream clocks when OE is asserted on the MPC9608FA?

When OE is driven high, all QA0–QA4 and QB0–QB4 outputs enter high-impedance state, but the PLL remains locked and the QFB output continues running. Downstream clocks fed from QFB (e.g., cascaded buffers) stay active and synchronized, enabling selective output disable without disrupting the timing hierarchy - a key feature for system-level power management and test isolation.

Is the MPC9608FA pin-compatible with other members of the MPC96xx family?

Yes - the MPC9608FA shares identical 32-lead LQFP pinout and electrical behavior with MPC9604FA (1:4) and MPC9610FA (1:12), differing only in output count and internal PLL configuration. This allows scalable clock tree design: same PCB footprint supports 4-, 8-, or 12-output variants, reducing layout iterations and inventory complexity across product families.